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Finding the Fourth Proportional to 13,591.13, 18,755.79 and 7,929.77

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Solution

The fourth proportional to 13,591.13, 18,755.79 and 7,929.77 is: 10,943.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,591.13 : 18,755.79 = 7,929.77 : x
  2. Step 2: Convert to fraction form
    13,591.13/18,755.79 = 7,929.77/x
  3. Step 3: Cross multiply
    13,591.13x = 18,755.79 × 7,929.77
  4. Step 4: Simplify right side
    13,591.13x = 148,729,007.09
  5. Step 5: Solve for x
    x = 148,729,007.09/13,591.13
  6. Step 6: Final answer
    x = 10,943.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.